Field Wiring for Current Sinking Configurations

Input Wiring

Connect the input signals to a device which can be current-driven, such as a switch or transistor output device. The connection requires an external power supply to feed current. The board inputs the ON/OFF state of the current-driven device as a digital value.

The input circuits of interface blocks of this product is illustrated in the image above. The signal inputs are isolated by opto-couplers (ready to accept current sinking output signals). The board therefore requires an external power supply to drive the inputs. The power requirement for each input pin is about 5.1mA at 24VD (about 2.6mA at 12VDC).